H5N1 bird flu now affects more than two-thirds of states

H5N1 bird flu now affects more than two-thirds of states

With highly pathogenic H5N1 avian influenza now circulating in Washington state and in Oregon poultry for the first time, the U.S. Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) confirms that the disease has now affected 34 U.S. states and killed 37.55 million birds.

Officials also confirmed new outbreaks of poultry in Wisconsin, Michigan, Minnesota, Iowa and Montana, as well as more positive tests on wild birds. The World Health Organization (WHO) provided an update on cases of human avian influenza in Colorado and China.

Washington, Oregon outbreaks in backyard flocks

Washington animal health officials reported an outbreak in backyard herds late last week.

In a May 6 news release, the Washington State Department of Agriculture (WSDA) said flock owners in Pacific County in the state’s southwest have reported sick and dying birds, and samples taken May 4 tested positive for the H5N1 strain on May 5 in state and federal labs. . APHIS said the flock contained 50 birds.

Amber Itle, DVM, a state vet, isolated the building and ordered the remaining birds culled to contain the outbreak.

This is the first detection of the virus in Washington state in 2022. No commercial poultry has been detected in the state.

“We have a robust response plan in place, but this development shows how important good biosecurity is, especially for backyard bird owners,” Ettle said. “We have not diagnosed the virus anywhere else in our domestic flocks, but the presence of the virus in migratory waterfowl presents a risk to backyard domestic birds. One step owners should take is to prevent contact between their birds and wild birds.”

The WSDA confirmed the second outbreak, involving 80 backyard chickens in eastern Spokane County, on May 7. The agency said the flock is a mix of geese, chickens, ducks and guinea fowl.

A veterinarian offered to examine a dead goose that showed unusual behavior, including walking abnormally, shaking its head, immobility, and fear of humans. The owner reported sick and dead birds. Laboratory tests confirmed H5N1 bird flu on May 7.

Etley said poultry owners should prevent access to ponds or standing water on their properties and keep different types of poultry such as ducks and geese spelled out separately from chickens and turkeys.

An infected backyard flock in Oregon in Lynn County in the northwest contained 180 birds. The Oregon Department of Agriculture (ODA) said in a May 6 press release that the Animal Public Health Agency (APHIS) confirmed the highly pathogenic H5N1 avian influenza (HPAI) virus that day.

“We knew a highly virulent avian influenza virus was coming our way after a bald eagle tested positive in British Columbia in early March,” state veterinarian Ryan Schulz said. “Since this discovery, we have worked hard to communicate with commercial poultry producers, veterinarians and the public about how to protect their flocks. Now more than ever, all bird owners must practice good biosecurity, prevent contact between their birds and wild birds, and report sick birds” .

In a news release, the USDA said outbreaks in Washington and Oregon have been confirmed by testing at APHIS Laboratories for National Veterinary Services in Ames, Iowa.

Hit a turkey farm wisconsin

Tests on May 7 confirmed highly virulent bird flu at a turkey farm in Barron County, Wisconsin. The farm is located in the northwest part of the state. The disease also broke out in Wisconsin in a flock of 30 birds in a backyard in nearby Pierce County.

Other outbreaks in the Midwest that involve backyard flocks include an outbreak in Oakland County, Michigan, a farm that houses 50 birds. outbreak among a flock of 10 birds in Anoka County, Minnesota; and an event involving 50 birds in Bremer County, Iowa.

This Montana affected backyard is located in Fergus County in the central part of the state and houses 20 birds.

The USDA, on its wild bird flu detection page, noted 29 positive tests, mostly in waterfowl and raptors, bringing the total to 1,035. New discoveries come mainly from North Dakota, with more crow deaths, and from Wisconsin. A dead animal in Minnesota was also found positive.

More details about human cases

WHO updates include the first human case of H5N1 bird flu in the United States, which was first reported on April 28, and the world’s first known human case related to the H3N8 strain, which was reported by China on April 26. The latest update clarifies the severity of the virus. A young boy was injured.

In a May 6 press release, the World Health Organization said the Colorado man, previously reported as an inmate at the state prison, fell ill on April 20 while slaughtering poultry on a commercial farm in Colorado that had been confirmed to be infected with the H5N1 virus. His sample was collected on the same day and confirmed by polymerase chain reaction (PCR) test on April 27.

The World Health Organization said the man was isolated and treated with antiviral drugs on April 26. He reported no other symptoms, was not hospitalized, and is now fully recovered.

In a press release today, the World Health Organization indicated that a 4-year-old boy from Henan Province in China developed a fever, cough and shortness of breath on April 5 and was hospitalized in critical condition on April 10 after becoming seriously ill. Pneumonia with respiratory failure. The boy received antiviral drugs in the intensive care unit.

A Chinese official confirmed H3N8 bird flu on April 24. The World Health Organization said that no other cases were discovered among the boy’s contacts.

Before he got sick, the boy had eaten chickens that were kept in the family’s backyard but had not been exposed to them directly before he got sick. Officials continue to conduct epidemiological and virological investigations.

The World Health Organization did not specify the current status of the boy.

The agency concluded, “The currently available limited epidemiological and virological information indicates that the avian influenza A (H3N8) virus has not acquired the ability to continuously transmit between humans. Therefore, the national, regional and international risk of disease spread is assessed as low.”

2022-05-09 20:13:55

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